The subject of this paper is development of a web system for renting musical equipment. The system consists of one server application and one or more client applications. Those applications communicate to each other via the Internet using the HTTP protocol. To be more precise, this paper documents all technologies needed to build the system, the systems structure and the process of developing the system itself. The server application is developed using Web-API technology from Microsoft's .NET framework. The client application is developed using Angular 2+.